Getting The Right Compression Ratio...

I'm installing the the closed chamber 60779's on my 340 right now. The pistons are TRW 2316's. I bought the closed chamber because I plan to build a 408. Well i decided to try them on my 340 with a cam change also. After talking BJR racing and Don at FBO I purchased a pair of Cometic head gaskets that thick enough to give me proper quench and clearace.